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WhatsApp provides no cryptographic management for group messages
(arstechnica.com)
This is a most excellent place for technology news and articles.
Or Matrix (warning some assembly required)
That study was 3 years ago, features to create private (invite only) group chats are supported now.
How can matrix be insecure when it keeps locking me out of my own messages?
Are parts of matrix closed source?
I actually found xmpp to be a breeze compared to most Matrix solutions.
Synapse is bloated, dendrite sucks and conduit is in perpetual beta and the uwu forks die too fast.
XMPP: